Underground (Part 1)

Underground - Sector 1: Mars City Service Sub-Level is the third level of The Lost Mission. The marine must find a keycard in order to go through security to deactivate the lockdown so he may proceed to the next sector to get to Exis Labs. Trites return in this level, and it is the first opportunity to acquire a chaingun.

Summary
To proceed further, the marine needs to disable security lockdown in Security Staton SL-3. To access the station, the marine needs a key card. The marine then goes though a whole bunch of corridors in a desperate hope of finding that key card. At some point he encounters a lift, upon activating which he's swarmed with trites. Anyway, it turns out the key card was on a catwalk of the same room as the door the marine needed to unlock. He unlocks the door, disables the security lockdown and leaves the part of Underground via a lift.

Objectives

 * Disable Local Security Lockdown
 * Acquire security station pass key


 * Return to Security Station
 * Use security terminal to gain access to service sub-levels.


 * Find Service Access to Exis Labs
 * Traverse service sub-levels to reach Exis Labs.

Areas

 * Elevator
 * Transfer Control
 * Service Access
 * Service Corridor SL-4
 * Pumping Station A-12
 * Filtration Control
 * Filtration Monitoring
 * Supply Storage
 * Service Corridor SL-11
 * Fluid Transfer Control
 * Security Station SL-3
 * Sub-Level Transfer
 * Transfer Bay

Characters

 * UAC announcer

PDAs

 * Bob Thompson. Found in Filtration Monitoring.

Enemies
The monster count is the same on all skill levels. * Three of the imps are crawlers.

Items
The item count is the same on all skill levels.

There are two health stations with 100 health each on the level.

Starting weapons
If the player starts this level via a console command, they will start with these items:

Locker codes
For the sources of the codes, see Doom 3 locker codes.
 * Storage locker #054 - Ammunition: 631. Contains: chaingun, ammo belt x2, med kit (small).

Secrets

 * In Transfer Control, in the place where the player finds the key card, one can climb under the floor via a gap and find some health and armor there.
 * As more of a trick than a secret, if the player runs out of the room immediately after calling the lift in the trite room, the door will lock behind you and trap the trites inside. The door will not unlock until most of the trites are dead. The trites can then be tricked into killing themselves by standing near the door and the window.

Trivia

 * The concept of an underground area reached from EnPro originated first as the EnPro Underground in Doom Resurrection.